It is important for PhD mentors to give feedback to students. There is much that one can learn through feedback. Advice of this nature is practical. The student has already done some work. The mentor has corrected it. He is in a position to give several points that are practical and can be implemented easily. The student is also in a position to absorb the feedback since he can relate it to the work he has done. Feedback allows the student to improve. He will not repeat the same mistakes. He can also show greater creativity and accuracy the next time he is working on a project.